This DuraFlex AL DuraFlex AL Length - 4 x 35 Foot is the ultimate in flexible components for strength and flexibility. Use with Category I gas-burning appliances with draft hood. UL 1777 aluminum liner. Flex lengths.ADA Compliant: No Collection: DuraFlex AL Finish: Aluminum Fuel Type: Natural Gas, Liquid Propane Length: 420 Pipe Class: Flexible Liner Pipe Inside Diameter: 4 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 35
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